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- W2023762718 abstract "전기화학적 석출에 의해 Ag-Au 합금층을 전극표면에 형성한 후 진한 질산으로 Ag만을 녹여내는 기법으로 나노다공성 금 (nanoporous gold, NPG) 구조를 만들어 전기화학적 산소환원에 대한 촉매현상을 관찰하였다. 석출과정의 전구체의 농도비를 달리하였을 때 나타나는 NPG 표면구조의 변화를 주사전자현미경으로 관찰하고 전기화학적 표면적을 측정하였다. 전기화학적 산소환원 촉매 효율은 NPG 표면의 구조에 따라 달라졌는데, Ag/Au 비율이 2.0에 해당하는 NPG 구조에서 가장 우수한 촉매 현상이 관찰 되었다. 표면구조의 변화에 따른 촉매 활성 변화에서 다공성 구조의 역할이 매우 큰 기여를 하는 반면 표면적의 변화는 큰 영향을 미치지 않았다. 최적 조건의 NPG 구조상의 전기화학적 산소환원 과정의 메커니즘을 회전원판전극 실험을 통해 관찰하였는데, 산성 조건에서 NPG 전극에서 전기화학적 산소환원은 과산화수소를 거쳐 물이 생성되는 2-단계 4-전자 환원 메커니즘으로 진행되었고 염기성 조건에서는 산소가 4개의 전자 전달을 통해 물로 직접적으로 환원 되었다. Abstract : We investigate the electrocatalytic activities for oxygen reduction at nanoporousgold (NPG) surfaces fabricated by selective dissolution of Ag from electrodeposited Ag-Au lay-ers on electrode surfaces. The structure of NPG was controlled by changing the concentrationratios of precursor metal complexes during the electrodeposition of Ag-Au layers and the cor-responding surface morphology and surface area was examined. NPG structures with Ag/Auratio of 2.0 exhibited the highest electrocatalytic activity for oxygen reduction, where the nan-oporous structure plays a key role, but the surface area does not affect on the electrocatalyticactivity. The mechanism of electroreduction of oxygen was investigated by rotating disk elec-trode techniques. In acidic media, oxygen was first reduced to hydrogen peroxide followed byfurther reduction to water through 2-step 4-electron mechanism, whereas the oxygen wasreduced directly to water by 4-electron mechanism in basic media.Keywords : Nanoporous gold, Electrocatalysis, Oxygen reduction, Rotating disk electrode" @default.
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- W2023762718 date "2012-05-31" @default.
- W2023762718 modified "2023-09-28" @default.
- W2023762718 title "Structure Dependent Electrocatalysis for Electroreduction of Oxygen at Nanoporous Gold Surfaces" @default.
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- W2023762718 doi "https://doi.org/10.5229/jkes.2012.15.2.83" @default.
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